06.03
10.5 Axes and spindles
10-351
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
10.5.19 Referencing an axis
When referencing a machine axis, the actual position value system of the ma-
chine axis is synchronized with the machine geometry.
Depending on the encoder type used, the machine axis is referenced with or
without traversing movements.
For all machine axes which are not equipped with an encoder providing an ab-
solute actual position value, referencing is carried out by traversing the machine
axis, the so-called reference point approach.
The reference point approach can be carried out either manually in JOG mode,
submode REF, or using a parts program. Reference point approach is started
using traversing keys PLUS or MINUS (depending on the parameterized refer-
ence point approach direction).
With incremental measuring systems, referencing is carried out using a
reference point approach divided into 3 phases:
1. Traversing to the reference cam
2. Synchronizing to the encoder zero marker
3. Approach reference point.
The following machine data and interface signals are independent with re-
spect to the individual phases of reference point approach:
MD11300: JOG_INC_MODE_LEVELTRIGGRD (INC/REF in jog mode)
MD34000: REFP_CAM_IS_ACTIVE (axis with reference cam)
MD34110: REFP_CYCLE_NR (axis sequence with channel-specific refer-
ence point approach)
MD 30240: ENC_TYPE (encoder type)
Set MD 34200: ENC_REFP_MODE (referencing mode)
IS: DB21, ... DBX1.0 (“Activate referencing”)
IS: DB21, ... DBX33.0 (“Referencing active”).
Referencing
Reference point
approach
Incremental
measuring
systems
Phase-independent
data
10 NC Start-Up with HMI Advanced
